US Patent No: 5,001,752

Number of patents in Portfolio can not be more than 2000

Public/key date-time notary facility

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Abstract

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A time notarization apparatus and method is disclosed which uses a secure, microprocessor based hardware platform which performs public key cryptographic operations to obtain trusted time stamping with a minimum of intervention by third parties. The hardware platform is encapsulated in a secure fashion so that the device's timestamping mechanism may not be readily tampered with or altered. The hardware platform includes at least one digital clock and a stable, secure storage device to record the private half of a public/private key pair. Coupled to both the digital clock and the storage device is a data processing device which performs public key signature operations in a secure and tamper-proof manner. Only the processing device has access to the secure storage device and its associated private key. The hardware platform also includes input/output means which receives a digital message which is to be digitally signed and timestamped and which outputs the resulting timestamped signature generated by the device. The hardware platform also includes a power source, (e.g., an on-board battery) to ensure the accuracy of the device's digital clock and the security of storage data prior to installation or in case of a power failure.

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Patent Owner(s)

  • Assignment data not available. Check USPTO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fischer, Addison M Naples, FL 33 3265

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
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MICROSOFT CORPORATION (11)
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WALKER DIGITAL, LLC (8)
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INTEL CORPORATION (3)
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The United States of America as represented by the Secretary of Commerce (1)
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XEROX CORPORATION (1)
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Other [Check patent profile for assignment information] (11)
5,136,643 Public/key date-time notary facility 218 1990
5,150,407 Secured data storage devices 123 1991
5,422,953 Personal date/time notary device 154 1993
5,619,571 Method for securely storing electronic records 87 1995
5,936,149 Personal date/time notary device 16 1995
5,720,034 Method for secure key production 23 1995
5,748,960 Method and apparatus for validating travelling object-oriented programs with digital signatures 139 1996
6,105,072 Method and apparatus for validating travelling object-oriented programs with digital signatures 43 1997
6,408,388 Personal date/time notary device 28 1999
6,865,678 Personal date/time notary device 5 2002
8,868,914 System and methods for distributing trusted time 0 2008